Locking mechanism for closures



April 16, 1929- M. J. CALLAHAN 1,709,459

LOCKING MECHANISM FOR CLOSURES Filed Sept. 26, 1925 5 Sheets-Sheet 1 lu'gl.

j l INVENTOR: v

' /1 7TOR N'EL April 16, 1929. M. J. CALLAHAN LOCKING MECHANISM FORCLOSURES \\N \N b cu Q NM 8 mq Nu M 1 MENTOR: M 4 OR/VEY.

April 6, 1929. M. J. CALLAHAN 1,709,459

LOCKING MECHANISM FOR CLOSURES Filed Sept. 26, 1925 5 Sheets-Sheet 4April 16, 1929- M. J. CALLAHAN 1,709,459

LOCKING MECHANISM FOR CLOSURES Filed Sept. 26, 1925 5 Sheets-Sheet 5Patented Apr. 16, 1929.

UNITED STATES MICHAEL J. CALLAHAN, 01' NEW YORK, N. Y.

LOCKING MECHANISM FOR CLOSURES.

Application filed September 26, i925. surname. same.

This invention has reference to locking mechanism and particularlyrelates to mechanism adapted to operate automatically to lock closuressuch as cupboard doors, doors to gymnasium and similar lockers, doors ordrops or closures for heating and ventilating units, and to unlock saidclosures through the medium of a key which operates also as a handle.

Heretofore, closures of the type indicated have been provided with alocking device in the form of a plurality of bolts or bars which, whenset in lockin position, are held by an independent lock 0 more or lesscomplicated pattern or type requiring the use of a key, in

addition to a device operating as a key, and a handle for manipulatingthe bolts or bars. Such locking mechanisms are expensive, cumbersome,complicated, and objectionable because of requiring a combined handleand key which is always in the way and cannot be removed from theclosure, and also requiring an independent key which must be carried orsecreted, and which is necessary to manipulate the special lock forlocking the firstnamed mechanism against opening or release.

It is amon the objects of my invention to provide a 100 ing mechanismfor closures of various types, which is sim le in construction,economical to roduce an install, easily manipulated, an requiring butone key which also operates as a handle and which is removable from theclosure to provide a threeoint lock for closures which may be mani uated for releasing purposes by a combined ey and handle and which, whencompletely released, is yieldingly held in released condition; toprovide a three-point lock for closures which, when the closure is swungto osition to close the opening, will automatically lock the closure; toprovide a three-point lock of character such that it is susceptible ofan indefinite number of combinations rendering it effective as a lockfor a plurality of lockers in a gymnasium, club house or other similarinstitution where it is desirable to have an indefinite number oflockers each provided with a distinctly difierent lock; to provide meansby which the last stated results can be obtained by either chan in theform of the escutcheon or socket, or tie orm of the handle-key, or both;and to provide means or a construction such as to enable the three-pointlock to be applied quickly, economically and with facility to theclosure which is to be locked in a predetermined position.

With the fore oing objects in view and others which wi 1 be detailedduring the course of this description, my invention consists in theparts, features, elements and mechanisms, and combinations thereof ashereinafter described and claimed.

In order that my invention may be clearly understood, I have provideddrawings wherein:

Fi ure 1 is a view showing a heating and venti ating unit in frontelevation,part broken away,having my locking mechanism in one of itsforms applied to the closure for the top part of the unit casing, thisbeing merely an example of an embodiment and use of my invention;

Fi re 2 is a view in sectional elevation on the line 2-2 of Figure 4,looking at the inside of the closure, shown open in Figure 1, my lockingmechanism being a plied thereto and holding the closure in 100 ed orclosed position;

Fi ure 3 is a view similar to Figure 2, showing the locking mechanism inunlocked position, and set and yieldingly held so that the closure canbe thrown open, as in Figure 1, by the handle-key without furthermanipulation of the latter or the locking mechanism;

Figure 4 is a view in sectional elevation of the structure shown inFigure 2 and taken on the line 44 of Figure 2;

Figure 5 is a view in sectional elevation showing the mechanism ofFigure 2 and taken on the line 5-5 of the latter figure. the view beingon a larger scale than that of Figure 2;

Figure 6 is a view in sectional elevation on the line 66 of Figure 2;

Figure 7 is a view in sectional elevation on the line 7-7 of Figure 3;

Figure 8 is an enlarged view in front elevation of a portion of theclosure, showing the escutcheon, socket or bushing connected to mylocking mechanism;

F' ure 9 is a view showing one form of my hand e-key in side elevation;

Figure 10 is a view in end elevation es" Figure 9;

Figures 11 and 12 are similar views showing, in sectional elevation. twodifferent forms of my locking mechanism applied to the closures oflockers, cabinets or similar structures, the locking mechanism of Figure12 being similar to that of Figures 1 to 8,in elusive;

Figure 13 is a composite view showing in front elevation a plurality oflockers or cabinets or closets, the View being on a much reduced scaleand showing four different variations of escutcheons or sockets;

Figure 14 is an enlarged detail showing in front elevation the socket orescutcheon combined with my locking mechanisn'i;

Figure 15 is a sectional View taken on the line 1515 of Figure 14;

Figure 16 is a view in side elevation of a portion of a handle-keyadapted to interact with the socket of Figure 14;

Figure 17 is a view in end elevation of Figure 16;

Figure 18 is a view similar to Figure 14 showing a different form ofescutcheon;

Figure 19 is a sectional view on the line 19l9 of Figure 18;

Figure 20 is a view in sectional elevation of a portion of thehan'dle-key adapted to cooperate with the socket of Figure 18;

Figure 21 IS a view in end elevation of Figure 20;

Figure 22 is a sectional view similar to Figure 15, but showing adifferent form of locking means;

Figure 23 is a view in elevation of a portion of a handle-key adapted tocooperate with the mechanism of Figure 22;

Figure 24 is a view similar to Figure 15 showing the key in position inthe escutcheon and the manner in which the structure of the key operatesto enable the closure to be manipulated;

Figure 25 is a perspective view of the escutpheon showing its details ofconstruction; an

Figure 26 is a perspective view of one form of handle-key showing itsdetails of construction.

Referring to Figures 1 to 10 of the drawings and, first, to Figure 1,wherein I have shown my invention applied to a heating and ventilatingunit adapted for installation in a room, the temperature of which is tobe regulated, the numeral 1 indicates the top portion of the unit inwhich the motor 2 and two fans and drums 3 are located, and the backportion of which is provided with louvers or dampers 4, and the frontportion of which is provided with a closure 5 hinged along its loweredge 6 and adapted to be swung up and down to either seal the opening oruncover and expose the motor and ot er devices in the said topportion 1. According to my invention, the closure 5, at its free edge ortop portion, is provided with a carrying plate 7, for the lockingmechanism, the same also strengthening or reinforcing the closure 5,said plate being flanged at one edge to impart rigidity and strength.The lower portion 8 of the unit carries, as usual, the heating element 9and water-pan or humidifying and air cleaning element 10.

The side walls of the upper portion 1 of the unit are each rovided withan outstanding lug or catch- )lhte 11 ada ted to receive behind it one othe locking ars of my locking mechanism.

' Referring, also, to the other figures of the drawings, viz, 2 to 10,inclusive, 1n locking mechanism will be seen to consist of twolongitudinally sliding locking-bars 12, each of which, at;- its innerend, is pivotally connected at 13 to a rotary locking-plate 14 carriedby a rotary escutcheon or socket 15 in the form of a bushing extendingthrough the closure 5, the plate 7, and rigidly secured to thelockingplate 14, the outer circumferential flange of the socketembracing the closure and, by the connection of its shank to thelocking-plate 14, firmly holding the locking-plate closely to thecarrying plate 7. IIItGI'POSQd between the plate 7 and the plate 14,there is interposed a washer 17 which surrounds the socket 15 andprovides a bearing and antifrictional means between the plate 14 and theplate 7, to prevent the former from having extensive bearing against thelatter, thus reducing friction between the two. The washer 17 ispreferably composed of some soft metal, suchas brass or copper which,when bufi'ed smooth and polished, acts more or less as a lubricant forthe operation of the lockingplate 14. As shown in Figures 2, 3, 6, thesocket 15, at its inner end, is provided with angular lugs 18 extendingthrough the locking-plate 14 and splayed over upon the latter tosecurely fasten the socket to the lockingplate. At their outer ends, thelocking-bolts or bars 12 pass through guiding loops 19, which hold themin proper operative osition and allow the necessary amount of reedom forthe lateral movement of the locking-bars during the rotary movement ofthe plate 14. The plate 7 is provided with a bracket 20, to which issecured one end of a tension spring 21, the opposite end of which ishooked upon the lug 22 of the plate 14, the spring normally tending tohold the plate 14 in the position of Figure 2 with the locking-barsprojected outwardly in opposite directions, so that their outer endswill pass behind or engage the cat-ch plates 11, and so that the lockinglug 23 on the locking plate will pass behind the downwardly dependingflange 24 extending entirely across the front edge of the top 25 of theunit. In this position, also. the stop lug 26, on the locking-plateengages the flange 27 of the plate 7 and prevents the locking-plate fromturning further in its rotary movement than is necessary to cause thelooking lug 23 to pass fully behind the flange 24 at the top of thecasing. In the opposite direction of movement of the plate 14, the stoplug 26 on the locking plate engages a stoppin 28 on the plate 7, thuspreventing the spring, when under tension, as shown in Figure 3, fromturning the plate 14 too far aroun In this position, the spring extendsfrom he lug 22 across the locking-plate 14 a little bit at one side ofthe axis of the lockingplate to the bracket 20, thus exerting tcnsionalull upon the locking-plate to temporarily hold the latter in unlockedposition with its sto lug 26 against the stop pin 28 and the loc ringbars 12 in retracted position. If the closure 5 is not jarred or struck,as when it is lifted to seal the opening at the top of the casing, thespring will hold the parts in the unlocked position shown in Figure 3;but,

when the closure 5 is forcibly closed against the flange 24 at the topof the casing, the jar will shift the locking-plate 14, and the springwill immediately rotate the locking-plate to position of Figure 2, thusshiftingthe threepoint lock into locking position. That is to say, asshown in Figure 3, the spring extends only slightly to one side of theaxis of the locking-plate so that it only requires a slight jar, jolt orblow u on the closure to cause the plate to shift, t 1118 enabling thespring'to exert its tension upon'the locking-plate and cause it torotate and return to the locking osition shown in Figure 2, with allthree ocking devices in proper position for locking purposes, viz, theends of the bars 12 behind the plates 11 and the locking lug 23 behindthe fiange 24. i

Referring particularly to Figures 5 to 10, inclusive, it will beseen'that the socket or bushing has a large central aperture which isclosed at its bottom by the central portion of the locking-plate 14, andthat said central portion of the locking-plate is provided with anelongated aperture 29, through which passes the angular lug 30 at theouter end of the barrel 31 of the handle-key, which barrel enters thecentral aperture of the socket 15. The lateral extension 32 of the lug30 is adapted to engage the inner surface of the locking plate when thehandle is turned, so thatthe latter can, upon a slight pull, draw theclosure 5 outwardly and thus open the top of the casing. The handle ofthe key is preferably made in two parts, the one 33 being rigidlyconnected to the barrel 31 and the part 3i heing pivotally mounted at 35upon the outer end of the part 33. The part 34 is beyond its pivot onopposite sides sufficiently long to engage the inner end of the barrel31 and be retained by the latter frictionally, thus enabling thehandle-key to be comfortably carried in :he pocket. It will beunderstood that this device is a combination key and handle; that is tosay, the barrel 31 fits in the socket 15, the lug 30 passes through theelongated aperture 29, and, by a slight turn of the handle,.theextension 32 will overlap the locking plate 14, so that the handlecannot be withdrawn, and a further turn of the handle will cause thelocking-plate 14 to be shifted against the tension of the spring 21 toremove the locking-bars and the locking lug 23 from sag, "s1 e projectsradially at the opposite side of the locking engagement with theirrespective rethus turning the cldsure'u on its hinges 6.

Viewing F igures2 an 3, it will be seen that the locking lug 23 and thesto lug 26 6f the plate 14 are each off center; t rat is to locking lug23 projects radially at one of the axis of plate 14 and stop lug 26 axisof plate 14, the eccentricity hcihg with reference to a line, such as6-43, passing across the axis of the plate. This provides for theperformance of the functions of the respective lugs with a comparativelyshort turning or rotary movement of the lockingplate 14, during theshifting movement of the locking-bars.

The foregoing shows the application of my invention to a heating andventilating unit, and this application is of great importance, since itis essential to keep the closure tightly in engagement with the casingduring the operation of the apparatus. The motor, when in operation,turns the fans very rapidly and the fans draw the air intothe' unit witha tendency to considerable vibration of loose parts. It is essential,therefore, that the closure should be very tightly held against thecasing, and my threeoint lock has been found in practice to per orm thefunctions effectively. Furthermore, the units are frequently installedin schools and the children are prone-to hang around and play with them,frequently endeavoring to open the closure in an effort to'see theinside? By fastening the closure at the three points indicated, it isimpossible for the edges of the closure to be shifted or pulledoutwardly. Moreover, there is no handle or device .which the childrencan lay hold of, because when the closure is once locked, the handle-keyis removed, leaving nothing but'the escutcheon 15 on the surface of theclosure. This is important from another stand oint, since there are noprojections upon which anything can be hung, or on which anything can besnagged or caught, or by which one may be injured.

In Figures 11, 12 and 13 I have shown other forms of my invention, and,with reference to Figure 11, it will be seen that the locking mechanismis arranged lengthwise vertically of a closure 36, which may be the doorof a wardrobe locker such as used in club houses, gymnasiums and similarplaces. In this figurc, the various parts of the locking mechanism whichcorrespond to those of Figures 1 to 10 are indicated by the samereference nu-' inerals. In this form, however, the stop-lug- 26 engagesa pin 37 which limits the rotary movement of the locking-plate 14 in thedirection of pull by the spring 21. The lockingbars 12 are eachpivotally connected at 38 to the inner end of a short lever 39, pivotedbetween its ends at 40 to. the inside of'the closure near its endandfront edge. The frame with the exception that the locking-bars 12,

instead of having a locking function, operate 7 the locking levers 39,and simultaneously Gil with the movement of said levers into lookingposition, the locking-lug 23on the locking-plate 14 moves into lockingposition behind a catch-plate 42 midway of the casing.

In Figure '12, the lockingmechanism is the same as in Figures 1 to 10,with the exception that the stop pin.37 is employed to engage the stop,lug 26, while the catch-plates 43 are on the top and bottom of thecasing or wardrobe instead of on the side, as in Figure 11. In bothinstances, the spring is held at one end by pin 20',

In Figure 13, I have shown a plurality of wardrobe lockers, such asshown in Figures 11 and 12; but, on a much reduced scale, the objectbeing to illustrate the manner in which the wardrobe-lockers can bearranged in tiers, and each locker may have a separate lock incapable ofbeing manipulated by the handle-key of the other lockers. This is shownclearly by the disposition of a longitudinal slot in the outer surfaceof the flange of the escuteheon 15; that is to say, the slot 44, in theescuteheon 15, at the extreme right of Figure 13, is at approximatel the90 point, while the slot 45 is approximately-at the 45 point, the slot46 is approximately at the 315 point, and the slot 47 is appr0ximatelyat the 270 point. From this it will be seen that slight variations inthe position of the slot will enable many variations in thecharacteristics of the lock, so as to prevent any one key from openingother than its own locker. Of course, the barrel 31 of the handle-keywill be provided with a laterally extending lug, more particularlydescribed presently in connection with Figures 14 to 17. Referring nowto Figures 14 to 26, details of variant forms of means for shifting thelocking-plate will be described. In Figures 14 and 15, the escuteheon 15is provided with a longitudinal slot 48 of angular form, and the lockingplate 14 is provided with an elongated slot 49. The barrel 31 of the keyis provided with a lug 50 corresponding in form to the slot 49, and witha lateral extension 51 adapted to overlap the locking plate on theinside, so as to engage the latter when a pull is exerted upon thehandle to swing the closure. The barrel 31 is also provided with alateral pin 52 adapted to enter the slot 48, and turn slightly in thelatter to an extent suflieient to enable the extension 51 to overlap theplate 14. Thus, a key of particular form is enabled to cooperate with acorrespondingly formed escuteheon.

' In Figures 18 and 19, I have shown the locking plate 14 as providedwith an clongated slot 53 and an outwardly projecting pin 54, adapted tocooperate with a key of the form shown in Figure 20, which in the outer;end of its barrel is provided with a socket 55 adapted to receive thepin 54. The lug 50 and extension 51 are the same as in Figures 16 and17. Figure 21 shows the sorket 55 to be slightly elongated, thusenabling the pin 54 to have a slight movement within the socket 55,enabling the barrel to be slightly shifted relatively to the plate 14,so as to enable the extension 51 of the key to overlap the plate aspreviously described.

In Figures 22 and 23, I have shown the locking-plate 14 as provided withan aperture elongated as in Figure 18 and correspondingly numbered, andwith an elongated aperture 56. The key-barrel, at its outer end, isprovided with a circular pin 57 adapted to enter the aperture 56 andmove slightly therein for the purposes heretofore described, withreference to the lug 50 and extension 51.

In Figure 24, I have shown the association of the key with theescuteheon and locking plate, so as to enable the cooperative actionthereof to be readily understood.

In Figure 25 I have shown the details of the escuteheon, including thelugs 18 which are splayed upon the locking-plate 14, the other partsbeing the same as in Figure 14. Figure 26 shows the key portion of thehandle in perspective, thus giving a better idea of the form of the lugand its extension.

From the foregoing it will be readily understood that many differentcombinations can be provided for the purpose of manipulating the lockingmechanism which I have shown in various forms, and by changing theposition of the slot 48 in the escuteheon, as shown in Figure 13, manydifferent combinations can be obtained. This is also true with referenceto the position of the slot 49, Figure 14, in the locking-platerelatively to the slot 48, in the escuteheon. By adding a pin such as 54to the locking-plate at various points around the circle, or byproviding the locking-plate with an additional slot 56 at various pointsaround the circle relatively to the slot 53, or by combining several ofthe features just described, a myriad of locking combinations can beprovided, so that many different wardrobes or wardrobe-lockers can beprovided, each with. its own key and opening handle.

It will be understood that. my invention is not limited to theapplications which I have chosen to show in the drawings for my lockingmechanism, and that it can be applied anywhere it is desired to lock adoor or closure or movable member.

It is noted that, in the forms of my invention shown in Figures 11 and12, a reinforcing or carrier plate, such as 7, shown in Fig; ures 2, 3and others, is not employed. Suc

late is in ortant in cases where the closure 1s light an flexible andmay be readily bent, because it adds strength and rigidity, holds thelocking mechanism in proper position at all times for accurateoperation, prevents the closure from being marred by screws or rivets orother means securing the various parts thereto. The plate being acarrier and capable of being securedto any form of casin gives to thelocking mechanism an indepen ence which characterizes it as an articleof manufacture.

Having thus described my invention, what I claim and desire to secure byLetters Patent is: I

1. A locking mechanism comprising a rotary plate havlng a rigid lugprojecting from the periphery t ereof, a key-socket rigidly connected tosaid plate, locking bars pivotally connected to said plate at oppositesides of the lug, and means cooperating with the plate lug and barsoperating as catch-plates therefor. i

2. In combination with a casing having a closure and a catch-plate, alocking mechanism comprising an escutcheon journaled in the closure, anda locking plate rigidl secured to the escutcheon, said plate having alocking lug cooperative with the catch-plate, and means imposing tensionon the lockingplate.

3. In combination with a closure, a threepoint locking means forsecuring the closure, and means for ieldingly holding the locking meansin unloc ed position.

4. In combination with a closure, :1 threepoint locking means forsecuring the closure, and means for holding the locking means yieldinglywhen in either locked or unlocked position.

5. As an article of manufacture, a locking mechanism comprising asupporting plate having a longitudinal flange; a locking-plate carryinga locking lug; 'an escutcheon journaled in the supporting plate andrigidly connected to the locking-plate so that the one may turn theother; said locking-plate having a stop lug adapted to cooperate withthe flange of the supporting plate to limit the movement of thelocking-plate into operative position.

6. As an article of manufacture, a locking mechanism comprising asupporting plate having a longitudinal flange; a locking-plate carryinga locking lug; an escutcheon ournaled in the supporting plate andrigidly connected to the locking-plate so that the one may turn theother; said locking-plate having a stop lug adapted to cooperate withthe flange of the supporting plate to limit the movement of thelocking-plate into operative position; and means for yieldingly holdingthe locking-plate in looking position.

7. As an article of manufacture, a locking mechanism comprising asupporting plate having a longitudinal flange; a locking-plate carryinga locking lug; an escutcheon journaled in the supporting plate andrigidly connected to the locking-plate so that the one may turn theother; said locking-plate having a sto lug adapted to cooperate with theflange o the supporting plate to limit the movement of the locking-plateinto operative position; and means for ieldingly holding thelocking-plate in unlocl ed position.

8. As an article of manufacture, a locking mechamsm comprising asupporting plate havlng a longitudinal ange; a locking-plate carrying alocking lug; an escutcheon ournaled in the supporting plate and rigidlyconnected to the ocking-plate so that the one may turn the other; saidlocking-plate having a stop lug adapted to cooperate with the flange ofthe supporting plate to limit the movement of the locking-plate intooperative position; and means for limiting the movement of thelocking-plate in the direction for unlocking the same.

9. As an article of manufacture, a locking mechanism comprisin asupporting plate having a longitudinal flange; a locking-plate carryinga locking lug; an escutcheon ournaled in the supporting plate andrigidly connected to the locking-plate so that the one may turn theother; said locking-plate having a stop lug adapted to cooperate withthe flange of the supporting plate to limit the movement of thelocking-plate into operative position; and means for yieldingly holdingthe locking plate.

10. As an article of manufacture, a locking mechanism comprising asupporting plate having a longitudinal flange; a locking-plate carryinga locking lug; an escutcheon ]Olll'- naled in the supporting plate andrigidly connected to the locking-plate so that the one may turn theother; said locking-plate having a sto lug adapted to cooperate with theflange o the supporting plate to limit the movement of the locking-plateinto operative position; and means for holding the lockingplate set inunlocked position.

11. As an article of manufacture, a locking mechanism comprising asupporting plate having a longitudinal flange; a locking-plate carryinga locking lug; an escutcheon journaled in the supporting plate andrigidly connected to the locking-plate so that the one may turn theother; said lockingplate having a stop lug adapted to cooperate with theflange of the supporting plate to limit the movement of thelocking-plate into operative position; and means for auto maticallysetting and holding the lockingplate in unlocked position.

12. As an article of manufacture, a locking mechanism comprisin asupporting plate having a longitudinaI flange; a locking-plate carryinga locking lug; an escutcheon journaled in the supporting plate andrigidly connected to the locking plate so that the one may turn theother; said locking-plate having a stop lug adapted to co operate withthe flange o the support-ing plate to limit the movement of thelockingplate into operative position; and means for yieldingly holdingthe locking-plate in lookmg position.

13. As an article of manufacture, a locking mechanism comprising asupporting plate having a longitudinal flange; a locking-plate carryinga locking lug; an escutcheon journaled in the supporting plate andrigidly connected to the locking-plate so that the one may turn theother; said 1ockingplate having a stop lug adapted to cooperate with theflange of the supporting plate to limit the movement of thelocking-plate into operative position; and means connected with thelocking-plate and adapted to swing from one side of its axis to theother to hold the same in both locking and unlocked position.

14. In combination with a casing and a closure therefor, a locking meansfor the closure mounted on the latter, said locking means comprising twolongitudinally reciprocating locking bolts; a rotary lockingplate; meansfor pivotally securin the looking bolts to the plate; an escutclieonjournaled in the closure and rigidly secured. to the locking plate;means holding the locking-plate under tension; and means for limitingthe movement of the lockin -plate at predetermined points in oppositedirections.

15. In combination with a casing and a closure therefor, a locking meansfor the closure mounted on the latter, said locking means comprising twolongitudinally reciprocating locking bolts; a rotary lockingplate; meansfor pivotally securing the locking bolts to the plate; an escutcheonjournaled in the closure and rigidly secured to escutcheon and alocking-plate rigidly connected together and both adapted to have rotarymovement, the locking-plate being provided with an elongated slot, and akey having a lug adapted to enter the slot and provided with anextension for \overlapping the plate.

17. Means for manipulating a locking mechanism comprising a rotary plateand a socket rigidly attached thereto, the plate having an elongatedslot therein, in combination with a key having a barrel adapted to enterthe socket and a lug adapted to pass throu h the said slot and having anextension or overlapping the plate, whereby the plate and socket may berotated by the key and the said plate and socket may be shifted at aright angle to the plane of rotation of the latter.

18. Means for creating a locking combination in locking mechanism,comprising a cylindrical socket and a locking-plate rigidly connectedtogether, the plate forming the bottom of the socket and closing thesame, the structure being provided with means adapted to cooperate witha key of corresponding structure, whereby the socket and plate may berotated.

MICHAEL J. CALLAHAN.

